Item talk:Q270798
From geokb
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"name": "Rare 40K decay with implications for fundamental physics and geochronology",
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"value": "10.1103/PhysRevLett.131.052503",
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"datePublished": "2023",
"dateModified": "2023-08-09",
"abstract": "Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts subatomic rare-event searches, nuclear structure theory, and estimated geological ages. A predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The KDK (potassium decay) collaboration reports strong evidence of this rare decay mode. A blinded analysis reveals a nonzero ratio of intensities of ground-state electron-captures (IEC0) over excited-state ones (IEC\u2217) of\u00a0IEC0/IEC\u2217=0.0095stat\u00b10.0022sys\u00b10.0010\u00a0(68%\u00a0C.L.), with the null hypothesis rejected at\u00a04\u03c3. In terms of branching ratio, this signal yields\u00a0IEC0=0.098%stat\u00b10.023%sys\u00b10.010%, roughly half of the commonly used prediction, with consequences for various fields [L. Hariasz\u00a0et al., companion paper,\u00a0Phys. Rev. C\u00a0108, 014327 (2023)].",
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